<template>
  <el-dialog
    title="裁剪图片"
    width="800px"
    append-to-body
    v-bind="$attrs"
    @close="onClose"
    v-drag-zoom
  >
    <el-row>
      <el-col :xs="24" :md="12" :style="{height: '350px'}">
        <vue-cropper
          ref="cropper"
          :img="options.img"
          :info="true"
          :autoCrop="options.autoCrop"
          :autoCropWidth="options.autoCropWidth"
          :autoCropHeight="options.autoCropHeight"
          :fixedBox="options.fixedBox"
          @realTime="realTime"
        />
      </el-col>
      <el-col :xs="24" :md="12" :style="{height: '350px', position: 'relative'}">
        <div class="image-upload-preview" :style="{width: previews.w + 'px', height: previews.h + 'px', maxHeight: '380px', maxWidth: '350px'}">
          <img :src="previews.url" :style="previews.img" />
        </div>
      </el-col>
    </el-row>
    <br />
    <el-row>
      <el-col :lg="2" :md="2">
        <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
          <el-button size="small">
            选择
            <i class="el-icon-upload el-icon--right"></i>
          </el-button>
        </el-upload>
      </el-col>
      <el-col :lg="{span: 1, offset: 2}" :md="2">
        <el-button icon="el-icon-plus" size="small" @click="changeScale(1)"></el-button>
      </el-col>
      <el-col :lg="{span: 1, offset: 1}" :md="2">
        <el-button icon="el-icon-minus" size="small" @click="changeScale(-1)"></el-button>
      </el-col>
      <el-col :lg="{span: 1, offset: 1}" :md="2">
        <el-button icon="el-icon-refresh-left" size="small" @click="rotateLeft()"></el-button>
      </el-col>
      <el-col :lg="{span: 1, offset: 1}" :md="2">
        <el-button icon="el-icon-refresh-right" size="small" @click="rotateRight()"></el-button>
      </el-col>
      <el-col :lg="{span: 2, offset: 6}" :md="2">
        <el-button type="primary" size="small" @click="uploadImg()">提 交</el-button>
      </el-col>
    </el-row>
  </el-dialog>
</template>

<script>
import { VueCropper } from "vue-cropper";
import { uploadFile } from "@/api/file/file";

export default {
  name: 'ImgCropper',
  components: { VueCropper },
  props: {
    imageUrl: {
      type: String,
      default: ''
    },
    cropWidth: {
      type: Number,
      default: 200
    },
    cropHeight: {
      type: Number,
      default: 200
    },
    filePath: {
      type: String,
      default: '/blog/mage-cropper'
    },
    fixedBox: {
      type: Boolean,
      default: true
    }
  },
  watch: {
    imageUrl(newVal, oldVal) {
      if (newVal) {
        this.options.img = newVal;
      }
    }
  },
  data() {
    return {
      // 弹出层标题
      title: "修改图片",
      options: {
        // 裁剪图片的地址
        img: this.imageUrl,
        // 是否默认生成截图框
        autoCrop: true,
        // 默认生成截图框宽度
        autoCropWidth: this.cropWidth,
        // 默认生成截图框高度
        autoCropHeight: this.cropHeight,
        // 固定截图框大小 不允许改变
        fixedBox: this.fixedBox
      },
      previews: {
        h: 200,
        w: 200
      },
      // 文件名
      fileName: '',
      // 显示文件管理
      showFileSelect: false,
      // 文件类型
      fileType: ["png", "jpg", "jpeg", 'blob']
    };
  },
  created() {
    this.options.img = this.imageUrl
  },
  methods: {
    /** 关闭弹框 */
    onClose() {
      this.$emit('update:visible', false);
    },
    // 覆盖默认的上传行为
    requestUpload() {
    },
    // 向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    // 向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    // 图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    // 上传预处理
    beforeUpload(file) {
      if (file.type.indexOf("image/") === -1) {
        this.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");
      } else {
        const reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = () => {
          this.options.img = reader.result;
          this.fileName = file.name
        };
      }
    },
    // 上传图片
    uploadImg() {
      this.$refs.cropper.getCropBlob(data => {
        uploadFile(this.filePath, data, this.fileName).then(response => {
          this.options.img = response.data.url;
          this.$emit('afterUpload', this.options.img)
          this.$modal.msgSuccess("添加成功");
        });
      });
    },
    // 实时预览
    realTime(data) {
      this.previews = data;
    },
    // 关闭窗口
    closeDialog() {
      this.options.img = this.imageUrl;
    },
  }
};
</script>
<style scoped lang="scss">
.image-info {
  position: relative;
  display: block;
  border: 0.5px solid #aaa;
  border-radius: 5px;
  overflow: hidden;
}

.image-info:hover:after {
  content: '+';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  color: #eee;
  background: rgba(0, 0, 0, 0.5);
  font-size: 24px;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  cursor: pointer;
  text-align: center;
}
.image-upload-preview {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 1px #ccc;
  overflow: hidden;
}
</style>
